Package: dieharder
Version: 3.31.1-4
Severity: normal
Dear Maintainer,
Thanks for packaging dieharder.
I find when testing /dev/urandom using the internal interface (-g 501)
the tests 10,11,12,13,14, 201,203,204 all fail with a p-value of 0.00000000
When testing /dev/urandom via stdin, these tests usually pass.
Specifically
dieharder -d 10 -g 501
dieharder -d 11 -g 501
dieharder -d 12 -g 501
dieharder -d 13 -g 501
dieharder -d 14 -g 501
dieharder -d 201 -g 501
dieharder -d 203 -g 501
dieharder -d 204 -g 501
all fail,
whereas
cat /dev/urandom | dieharder -d 10 -g 200
cat /dev/urandom | dieharder -d 11 -g 200
cat /dev/urandom | dieharder -d 12 -g 200
cat /dev/urandom | dieharder -d 13 -g 200
cat /dev/urandom | dieharder -d 14 -g 200
cat /dev/urandom | dieharder -d 201 -g 200
cat /dev/urandom | dieharder -d 203 -g 200
cat /dev/urandom | dieharder -d 204 -g 200
usually pass.
I would have expected the results to be similar. It suggests the
internal interface to /dev/urandom is broken,
or the documenting/text is wrong, and generator 501 is NOT urandom but
something else.
The blocking pool /dev/random (-g 500) takes a lot longer to test, but
I'm getting similar results there. The internal one seems broken.
(I would not expect /dev/random to fail ANY tests of randomness!)
Feeding via stdin, /dev/random looks fine.
Example results for urandom using test 11 which is quite quick.
-----------------------------------------------------------------------------------------------------------
~$ cat /dev/urandom | dieharder -d 11 -g 200
#=============================================================================#
# dieharder version 3.31.1 Copyright 2003 Robert G.
Brown #
#=============================================================================#
rng_name |rands/second| Seed |
stdin_input_raw| 3.23e+06 | 159920532|
#=============================================================================#
test_name |ntup| tsamples |psamples| p-value |Assessment
#=============================================================================#
diehard_2dsphere| 2| 8000| 100|0.57695137| PASSED
-----------------------------------------------------------------------------------------------------------
-----------------------------------------------------------------------------------------------------------
~$ dieharder -d 11 -g 501
#=============================================================================#
# dieharder version 3.31.1 Copyright 2003 Robert G.
Brown #
#=============================================================================#
rng_name |rands/second| Seed |
/dev/urandom| 1.53e+06 |1135703220|
#=============================================================================#
test_name |ntup| tsamples |psamples| p-value |Assessment
#=============================================================================#
diehard_2dsphere| 2| 8000| 100|0.00000000| FAILED
-----------------------------------------------------------------------------------------------------------
-- System Information:
Debian Release: jessie/sid
APT prefers unstable
APT policy: (500, 'unstable'), (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 3.13-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages dieharder depends on:
ii libc6 2.18-4
ii libdieharder3 3.31.1-4
ii libgsl0ldbl 1.16+dfsg-1
dieharder recommends no packages.
dieharder suggests no packages.
-- no debconf information
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